This error message means that hMailServer has not been able to write the email message to disk. The most common cause for this to happen is that the Data directory path specified in hMailServer.ini path isn't correct.
So to solve the problem, simply open hMailServer.ini and correct the path.
Use this forum if you have installed hMailServer and want to ask a question related to a production release of hMailServer. Before posting, please read the troubleshooting guide. A large part of all reported issues are already described in detail here.
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